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/*
* Copyright (c) 2023-2024 Ian Marco Moffett and the Osmora Team.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Hyra nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _VM_PMAP_H_
#define _VM_PMAP_H_
/*
* Each architecture is expected to implement
* this header. It should contain a `struct vas'
* which will contain information about a VAS
* (virtual address space)
*
* On AMD64 this struct contains: PML4, etc
*
* XXX: Compiler errors pointing to this include means you
* forgot to implement it!!!
*
* `struct vas' MUST have a `struct spinlock lock' field!!!
*/
#include <machine/vas.h>
#include <vm/tlsf.h>
#include <sys/types.h>
#include <sys/spinlock.h>
/* prot flags for mappings */
#define PROT_WRITE __BIT(0) /* Writable */
#define PROT_EXEC __BIT(1) /* Executable */
#define PROT_USER __BIT(2) /* User accessible */
#define is_vas_valid(vas) (vas.top_level != 0)
/*
* vm_ctx - Per core virtual memory context
*/
struct vm_ctx {
uintptr_t dynalloc_pool_phys;
size_t dynalloc_pool_sz; /* In bytes */
tlsf_t tlsf_ctx;
struct spinlock dynalloc_lock;
};
/*
* Create a virtual address space
* and return the descriptor.
*/
int pmap_create_vas(struct vm_ctx *, struct vas *);
/*
* Switch the current virtual address space
* to another.
*/
void pmap_switch_vas(struct vm_ctx *, struct vas);
/*
* Read virtual address space descriptor
* and return it.
*/
struct vas pmap_read_vas(void);
/*
* Map a physical address to a virtual address.
*/
int pmap_map(struct vm_ctx *, struct vas, vaddr_t, paddr_t, vm_prot_t);
/*
* Get rid of a virtual address space and free
* resources.
*/
int pmap_free_vas(struct vm_ctx *, struct vas);
/*
* Unmap a page.
*/
int pmap_unmap(struct vm_ctx *, struct vas, vaddr_t);
/*
* Architecture specific init code for pmap
*/
int pmap_init(struct vm_ctx *);
#endif /* _VM_PMAP_H_ */
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